Cell production process

The process of cell activation -- formation

Formation is the process of activating the cell after liquid injection. Through charging and discharging, chemical reactions occur inside the cell to form SEI film (SEI film: a passivation film will be formed during the first cycle of lithium battery due to the reaction between the electrolyte and the anode material at the level of solid and liquid phase, just like plating a layer of film on the battery core). To ensure the safety, reliability and long cycle life of the subsequent cell during the charge-discharge cycle. To activate the performance of the cell, it also goes through a series of "physical examination processes" such as X-ray monitoring, insulation monitoring, welding monitoring and capacity testing.

The formation process also includes the second infusion of electrolyte after the cell is "activated", weighing, welding of liquid injection port, and air tightness testing; Self discharge test high temperature aging and standing ensure product performance.

Each cell has a separate QR code that records its date of birth, manufacturing environment, performance parameters and so on. A robust traceability system can put any information on record. In case of abnormal, production information can be retrieved at any time; At the same time, these big data can provide targeted data support for the subsequent improvement design.